The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Mar. 16, 2001
David Allan Clarke, Brighouse, GB;
Bernard Mark Heron, Yorkshire, GB;
Christopher David Gabbutt, Lancashire, GB;
John David Hepworth, Lancashire, GB;
Steven Michael Partington, Huddersfield, GB;
Stephen Nigel Corns, Huddersfield, GB;
James Robinson Limited, Huddersfield, GB;
Abstract
A photochromic grey coloring 2H-naphtho[1,2-b]pyran of formula (1) wherein R is selected from mono-, di- or poly-substituted aryl groups, mono-, di- or poly-substituted naphthyl groups and mono-, di- or poly-substituted heteroaryl groups, wherein at least one substituent is a nitrogen containing group, including amino, C -C and C -C alkylamino, C -C and C -C dialkylamino, C -C dialkenylamino, C -C or C -C di(polyalkenyl)amino, arylamino, diarylamino, C -C alkylarylamino, tetra (C -C linear or branched alkyl) guanidino and cyclic-amino groups and at least one of R and R , which may be the same or different, is selected from C -C N alkylamino C -C N-alkylamido, C -C N,N-dialkylamido, amido, nitro, amino, C -C alkylamino, C -C dialkylamino, C -C dialkenylamino, C -C di(polyalkenyl)amino, arylamino, diarylamino, C -C alkylarylamino, or cyclicamino groups. The compounds may be combined with a polymeric host material such as plastic or glass to make a sunglass lens, an ophthalmic lens or a window. The compounds may also be included in an ink or a fuel.